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Study light? Do you mean warning light?
There are sensors clipped into the brake pads on the front left and rear right wheels. When the brake pads get very thin, those sensors rub on the brake rotors, and the light illuminates in the dash indicating that it is time to replace the brake pads.
The light can also illuminate if something damages the wire to the sensor. I usually replace my pads before they get down to the sensors, so I re-use my old sensors. Although the wires are fairly well secured to the suspension, after a few years, the wires can get chaffed from the wind blowing them around, and the damaged wire can turn on the warning light.
When the brake sensor light comes up it normally should show a small message on the screen which side is it, there are four sensors on each wheel and the only way to know which ones are to be replaced is to physically exam them. Take the wheel off and have a look if they are less than 5mm replace them.
Rear brakes or Front Brakes? Once the rear drums are removed you have access to all the brake parts for the rear brakes. As far as the front pads are concernedonce you remove teh wheel you ahve access to the caliper assembly which is removed by loosening the two retaining bolts on the back side of the caliper and it lifts off to remove and replace the pads themselves then goes right back on. You will need an Allen Wrench of the proper size to remove the retaining bolts, a caliper compressor to do the front brakes. To remove the rear brakes once the drum is removed you have to use a brake repair tool or a large Flat head screwdriver and a large pair of needle nose pliers. The initial retaining clips for the rear brakes can be removed by grasping the exposed end and turning 90 degrees then use the screwdriver to stretch and leverage off the spring assemblies that operate the brakes.
i need anyone one to help me with this problem, i have a BMW328ci and i tried tyo get out of my house this morning and all roads were frozen and the car started sliping and i activated the dcs button and car was still slipering and then brake, ABS, CBC & DSC lights turned on and i need to know how i can reset these lights so they can come off
did you also replace the brake sensor wire with the brake job? its similar to #12 in this pic for the front axle(http://www.realoem.com/bmw/showparts.do?model=EU33&mospid=47722&btnr=34_0757&hg=34&fg=05 if it was done at a BMW dealer, then replacing the sensor wire is part of the job. if replaced at an independent shop, then they might not know. each axle will have this sensor wire that wears just like the pads. replace this sensor wire and all should be fine.
I am assuming that you have a burned out head light bulb. 1) Open hood. 2) Working in back of headlight assembly, grasp rear of bulb socket (harness connector) and turn counterclockwise 90 degrees. Pull bulb out of headlight assembly. 3) Disconnect harness connector from bulb (gently pry, it's plastic) 4) Installation is reverse of removal. (Do not touch halogen bulb with bare skin-oils from hand will cause bulb to burn out.) Align tabs on bulb base to cutouts on rear of lens assembly. (Note bottom tab is wider than other two) Secure bulb by rotating clockwise 90 degrees. Low beam bulb H9006 High beam bulb H9005